ESP8266 Community Forum

- Sun May 21, 2017 7:39 pm #66169 This might be a silly question, however, I don't know what is happening.

I have a simple script who fetches google time and I need to set it to the time global variable. So, inside the receive event, I print the time fetched and it works properly.

The problem is the variable time always as empty when called outside the event. Here is the code:

Code: Select alllocal function build_request()
  local payload = "HEAD / HTTP/1.1\r\n"..
                  "Host: google.com\r\n"..
                  "Accept: */*\r\n"..
                  "User-Agent: Mozilla/4.0 (compatible; esp8266 Lua;)"..
                  "\r\n\r\n"
  return payload
end

local function connect(sck)
  local post_request = build_request()
  sck:send(post_request)
end

local function receiver(sck, callback)
  time = string.sub(callback,string.find(callback,"Date: ")
         +6,string.find(callback,"Date: ")+35)
  print(time) -- WORKS!
end

local function disconnect(sck)
  sck = nil
end

function fetch()
  socket = net.createConnection(net.TCP, 0)
  socket:on("receive", receiver)
  socket:connect(80, 'google.com')
  socket:on("connection", connect)
  socket:on("disconnection", disconnect)
end

print(fetch())
print(time)


Here is how I'm calling the function (using nodemcu-uploader terminal):

Code: Select all➜  temperature nu terminal
--- Miniterm on /dev/cu.wchusbserial1410  115200,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

> dofile('lib/test.lua')

> Mon, 22 May 2017 00:35:10 GMT


As we can see, the print(time) does not print. How could I have a function that returns the time variable value?
Any help would be really appreciated! Thanks